Accumulated Other Comprehensive Loss (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010
Reconciliation of Accumulated Other Comprehensive Loss
Pensions and other postretirement benefits, beginning balance	$ (159)	$ (194)
Foreign currency translation adjustments, beginning balance	(261)	(220)
Accumulated other comprehensive loss, beginning balance	(420)	(414)
Translation adjustments	(43)	(41)
Amortization of prior service cost	(2)	1
Amortization of actuarial net loss	14	14
Actuarial net gain / (loss) arising in the year	(148)	20
Effect of exchange rate		5
Deferred taxes	44	(5)
Pensions and other postretirement benefits, ending balance	(251)	(159)
Foreign currency translation adjustments, ending balance	(304)	(261)
Accumulated other comprehensive loss, ending balance	$ (555)	$ (420)

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